Pan card application rejected

Dear sir, nsdl has rejected my new pan card application by giving reason of improper name of my mother.I have submitted voter ID as an address proof in which my mother's middle name is printed in front of husband name and her name is printed in the format of last name and first name above husband's name whereas at the time of application I submitted full name of mother as there was no other option available.For this application I spent rs.150/- Including courier charges.Now, as per telephonic conversation with customer care of nsdl the lady has asked me to reapply for the same with their application charges or asked me to send any other address proof. Please guide me whether they have to accept my application without sending other address proof or not. Thank you.